Camera shutter



Sept 3, 1929 M. ELLlf-soN ET AL CAMERA SHUTTER Filed Sept. l5, 1926 gwuentm Patented Sept', 3, 1929.A

UNITED STATES'PATENT CFFICE.

MICHAEL ELLISON AND EDWARD S. MCAULIFFE, OF LOS ANGELES, CALIFORNIA, AS- SIGNORS, BY MESNE ASSIGNMENTS, T ELLISON KAMRA COMPANY, A CORPORA- 'rIoN or DELAWARE CAMERA Application led September This invention relates to camera shutters y Y of the two-leaf-type and an object of the invention is simplicity of construction and operation.

A further Objectis to make provision for extreme rapidity of opening and closing of the shutter-so as nearly as possible to expose all parts of the sensitized film equally.

The accompanying drawings illustrate the invention:

Figure 1 is a view partially iii-section of a camera provided with a shutter constructed lin accordance with the provisions ofthis invention.

Fig. 2 is an enlarged view of the shutter and its support, partly in section, theshutter members being shown in open position.

Fig. 3 is an enlarged sectional view mainly on the line indicated by 3 3, Figure 1.

In our copending application for patent for camera, Serial Number 132,434, filed vAugust 30, 1926, we have described in detail and claimed the shutter operating mechanism indicated in general at 4 in Figure 1.

It is not necessar to describe the said mechanism in detail erein, it suiiicing to state that the arm 5, when the camera is operated, is caused by the spring 6 to be given a quick movement to the right in Figure 1. When this occurs said arm strikes a shoulder 7 on an arm 8 which is pivoted at 9 to one side of asupport 10. In this instance the support 10 forms a box having an orifice 11 to permit the light rays to pass to the film.

The arm 8 is4 normally held retracted in the position shown in Figure 1 by a spring 12, which has one end coiled around the pivot- 9 and which rests against an outstanding ear 13 on the arm 8. `4The spring 12 is placed under compression when assembled and is not as strong as the spring 6, since the actuation of the arm 5 to the right in Figure 1" is relied upon to swing the arm 8 to the right.

Pivoted at 14 to one side of the support 10 are two L-shaped shutter leaves 15, 16, the pivot 14 being positioned so that the leaf 15 will overlap the leaf 16 when the shutter is in the closed position shown in Figure 1.

The front transverse walls 17,171 of the shutter-leaves 15, 16 are arcuate, the center A of radius being the pivot 14. Also rthe front' wall 18 of the support 10 is curved to the sHU'r'rER.

13, 1926, serial No. 135,071.

same radius center as clearly shown in Figure 2. It is the wall 18 that is provided with the orifice 11 and when the shutter leaves are in open position the front wall 171 of the leaf '16 is positioned above the orifice 11 and the front wall 17`of the shutter leaf 15 is positioned below said orifice. One leg `of each shutter Vleaf is provided with an angular cam slot, the two limbs of the slot in the leaf 15 being indicated at 19, 20 and the two limbs of the slot in the leaf 16 being indicated at 21, 22. The forward limbs 19, 21 of the cam slots slant away from one another when the leaves are in the open position shown in Figure 2 and extend toward each other when the leaves are in the closed position shown in Figure 1. The other leg of each shutter leaf extends parallel to the axis of the pivot 14. l

The arm 8 carries a stud 23 that projects into the cam slots, the limbs 20, 22 of the cam slots being constructed to permit of the stud 27 moving in an arc about the pivot 9 without entailing motion of the shutter leaves when the stud 23 is moving in the slot limbs 20, 22. The slot limbs 19, 21, are positioned so that when the shutter leaves are in the closed position shown in Figure 1 thestud 23 is positioned at the extreme forward ends of the cam slots.

The invention operates as follows: The arm 5 being actuated in a manner set forth in the above mentioned application will strike the shoulder 7 and suddenly kick the arm 8 to the right from the position shown in Figure 1 to that shown in Figure 2, thus vcausing the stud 23 to first traverse the slot iimbs 19, 21to force the shutter leaves in open position and then to traverse the slot limbs 20, 22 to the rear ends of said slot limbs. Immediately thereafter the spring 12 retracts the arm 8, causing the stud 23 to move forwardly in the slot limbs 20, As stated above, while the stud 23 is in the slot limbs 20, 22, no movement of the shutter leaves occurs and, accordingly, the duration of exposure of the film depends upon the strength 'of the spring 12, the force with which the arm 5 strikes the shoulder 7 and the length of the slot legs 20, 22. Thereafter continued forward swinging of the arm 8 causes the stud 23 to move forwardly in the slot limbs 19, 21, thereby actuating the shutter leaves from the open position shown in Figure 2 to the closed position shown in Figure l.

lt will be readily seen from the foregoing that the shutter leaves are quickly. actuated into both open and closed positions, thus giving substantiall57 uniform illumination of the sensitive film being exposed in the camera by operation of the shutter. 1 We claim: Y

'1. A camera shutter comprising two L-shape shutter leaves pivoted to swine on the same axis and provided with cam slots, a pivotally mounted arm provided with a stud engaging in said slots, the slots shaped to effect opening of the shutter leaves when the stud travels in one direction and to eect closing ofthe shutter leaves when the stud travels in the opposite direction, a spring to move the arm 'in the last mentioned direction, and means to operate the arm in the iirst mentioned direction against the pressure of the spring.

2. A camera shutter comprising two shutter leaves pivoted to swing on the same axisy and provided with cam slots and provided with transverse walls adapted to overlap whenV the leaves are closed, -a pivotally mounted varm provided with a stud engag-v ing-in saidslots, the vslotsshaped to effect opening vofthe shutter leaves when the stud travels in one direction and to eiiect closing of the vshutter leaves when the stud travels in the opposite direction, a spring to move the arm in the last mentioned direction, and

means to operate the arm in the iirst mentioned direction .against'the pressure ofthe spring.

3.v A camera shutter comprising two shutter leaves ivoted to swin Aon the same axis and provi edfwith lcam s ots and provided with transversev lwalls adapted to overlap when the leaves areclosed, a pivotally mounted arm provided-with a stud engaging in said slots,":the slots Ahaving limbs shaped to elect opening of the shutter leaves when the stud vtravels in one direction in v said limbs and to' effect closing` of the, shutter leaves when the stud travels in the opposite direction in said limbs, the slots having other limbs shaped to maintain the shutter leaves in open position when the stud travels -in said other limbs, a spring to move the Y a'rm in the last mentioned direction, and means to operate thearm in the first men# tioned direction against the pressure of the spring.

4. A camera shutter. comprising; a support rovided with a wall having 'an orifice, two utter leaves pivoted to .the support to swing on the same axis and provided with cam slots and provided with transverse walls adapted to overlap infront of the orice when the leaves are closed,v an arm pivoted to said support and provided With. e Studeffect opening of the shutter leaves to un- `cover the orifice when the stud travels in one direction and to elect closing ofthe shutter leaves in front of the orice when the stud travels in the opposite direction, a spring to move the arm in the last mentioned direction, and means to operate the arm in the first mentioned direction against the pressure of the spring.

5. A camera shutter comprising pivotally mounted l.shaped shutter leaves, one leg of each leaf extending parallel to the axis of the pivot, a pivotally mounted arm, means operable by oscillation of the arm to move the leaves apart and to close the leaves together, a spring tending to hold the arm retracted, and means to move the arm against the power ofthe spring and to then release said arm.

6. A camera shutter comprising pivotally mounted L-shaped shutter leaves, one leg of each leaf extending parallel to the axis oi vthe pivot, a pivotally mounted arm, means operable by oscillation ofthe arm to move tlie leaves apart and to close theleaves together, a sp1-ing tendingto hold the arm re' traeted, and means disconnected from the arm to strike the arm away from its retracted position. n

7 A camera shutter comprising pivotally mounted shutter leaves provided with angular cam-slots, the forward limbs of said slots y slantingtaway from one anotherwhen the leaves are separated in open osition and said limbs extending toward eac other when the leaves are closed together, Aa stud on the arm projecting into the cam-slots,'.a springQ tending to hold the arm in a position with the stud in the forward ends of the cam' slots and means to move the arm'in a direc'-- -tionto cause the stud `to move toward the v.

rear ends of the cam-slots, said means there-l after automatically releasing .the arm to'.-

permit the spring .to retract vthe arm.

. 8. A camera shutter comprisinglpiv'otally mounted shutter leaves, a movablmounted arm, a spring tending to holdit e-arm re- .'tracted, means operable by the arm inthe spring-compressing movementthereof to move the leaves apart, a second movably mounted arm, a' spring tending to move the second arm into engagement with the first mentioned-arm, and mechanism releasably otally mounted shutter leaves provided with cam slotsandprovided with transverse walls adapted to overlap when the leaves are closed, the slots registering at one end when A the leaves are closed and registering at the oppositeen.gi,"wl.1e1l theleaves are open, e139 portion of each' slot extending at an angle to operate the arm against the pressure of with respect to the path Vof travel of the the spring.

slot as the shutter leaf swings on its pivot, Signed at Los Angeles, California, this 7 10 v a pivotally mounted arm provided with a day of September 1926. 5 stud engaging in said slots, a spring yieldingly holding the arm' with the stud inthe MICHAEL ELLISON. first mentioned end of the slots, and a means I EDWARD S. MCAULIFFE. 

